Waterloo is the second studio album by the Swedish pop group ABBA, and the first released internationally. It was originally released on 4 March 1974 in Sweden through Polar Music. The album's title track won ABBA the 1974 Eurovision Song Contest and became a global hit, launching the group's career.

ABBA are a Swedish pop supergroup formed in Stockholm in 1972 by Agnetha Fältskog, Björn Ulvaeus, Benny Andersson, and Anni-Frid Lyngstad. The group's name is an acronym of the first letters of their first names arranged as a palindrome. They are one of the most popular and successful musical groups of all time, and are one of the best-selling music acts in the history of popular music.